CN1156828A - Vector electricity meters and associated vector electricity metering methods - Google Patents

Vector electricity meters and associated vector electricity metering methods Download PDF

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Publication number
CN1156828A
CN1156828A CN96117256.8A CN96117256A CN1156828A CN 1156828 A CN1156828 A CN 1156828A CN 96117256 A CN96117256 A CN 96117256A CN 1156828 A CN1156828 A CN 1156828A
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signal
interval
power circuit
orthogonality
phase
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CN1108528C (en
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M·E·霍夫曼
R·J·普罗沃斯特
T·梅勒
G·P·拉瓦伊
M·J·普利斯
D·D·埃尔莫尔
W·R·杰默
J·W·马梅
D·F·布洛克
S·S·普特查
D·A·斯塔弗
A·C·伯特
C·W·克里藤登
E·D·埃奇
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General Electric Co
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General Electric Co
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
    • G01R21/1331—Measuring real or reactive component, measuring apparent energy

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Inverter Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

Line voltage and line current signals are sensed on a power line having at least one conducting path. The sensed line voltages and line currents are converted into a digital signal. A phase-to-neutral voltage signal and phase current signal are computed from the digital signal to thereby define a phase of the power line. An interval of orthogonality is determined from the sensed voltage and current signals, coinciding with passage of an integral number of cycles of a fundamental frequency reference signal which is computed from the computed phase-to-neutral voltage signal. A vector metering quantity is computed for the determined interval of orthogonality from the computed phase-to-neutral voltage signal and the computed phase current signal. The vector metering quantities to be computed may be identified and computed based upon an associated detent and also may be computed based on an identified circuit topology.

Description

To electrometer and relevant vectorial quantity measuring method
The present invention relates to power circuit and measure, specifically, be related to power circuit and measure equipment and method to volume and electricity with many conductive paths.
When distributing electric energy, public power companies is generally found to measure and be favourable to the relevant electric weight of consumer's transmission of electric energy, these electric weight have accurately reflected the cost to electric energy that the consumer send, thereby divide the cost of transmission of electric energy in all users of electric system liberally.A long time ago, public company only just recognizes according to the measurement of actual power-watt-hour of being carried and can not accurately reflect cost to client's transmission of electric energy to client's charge.For example, big industrial user has inductive load, such as big induction motor etc., these inductive loads cause significant phase shift between the voltage and current of power circuit, therefore need shift to an earlier date the phase angle of engine and carry out capacitance compensation by public company, with the sustaining voltage level, effectively to consumer's transmission of electric energy, and the stability of keeping electric system.This additional production basic equipment cost is not reflected on the measured value of consumer's measurement point institute transmission of electric energy.
Therefore, develop other and measured the method for electric power.For example, public company is general not only to charge by the active load energy of the watt-hour that flows to the user, and charges by reactive load energy and the power factor (cos θ) of reactive volt-ampere hour (being var hour).By measuring watt-hour and reactive volt-ampere hour, electric utility company just can apportion the cost of transmission of electric energy more accurately to those consumers that inductive load is arranged from power transmission network demand maximum.
First people recognize that also error possible in the power measurement is owing to the non-sinusoidal state in this generation note.Before about 60 years, the electric system slip-stick artist attempts for causing the overall unified theoretical model of electric system exploitation of harmonic wave and distortion.In the paper that is entitled as " definition of electric power and correlative ", this model has been described for the Harvey L.Curtis of the nineteen thirty-five AIEE State Bureau of Standardization that meeting is published in summer and Francis B.Silsbee.Definition in the paper of Curtis and Silsbee is to obtain from the tri-vector model that is applicable to all harmonic waves and mutually electric power.Through the publication of " IEEE Std100, electric power and electronic term standard dictionary " latest edition, these define intact basically reservation.
In Figure 19 illustration the relation of vector power of power circuit.ANSI/IEEE STD100 electric power and electronic term dictionary are defined as the value of quadrature component for the two-dimentional vector power of " active power " P and " reactive power " Q to " phasor power " S.In system, promptly have more than " multiphase system " of a conductive path and " in the monophase system, for all harmonic waves, phasor power S is the active power P of system and the vector sum of reactive power Q more than a conductive path.Just as the skilled personnel to understand, if all elements all are ohmic, phasor power S just equals active power P.Here it is phasor power, a kind of form of the phasor volt-ampere hour of specifically public company traditional measurement and charge or another kind of form.Usually, public company utilizes the phasor volt-ampere hour of the fundamental frequency of traditional watthour meter and var hour meter measuring system voltage.
" apparent power " U is defined as the value that quadrature component is the tri-vector power of active power P, reactive power Q and three-component (" distortion power " D).Apparent power and apparent volt-ampere hour provide the more comprehensive measurement of power circuit characteristic.For the two-terminal circuit of isolating, apparent power U can regard scalar as, the product of rms voltage and electric current in single conductive path.Yet in the system that has more than a lead, vectorial apparent power and vectorial apparent volt-ampere hour are vectors, the vector sum of meritorious, the idle and distortion power component of all phases and harmonic wave.Therefore, vectorial apparent power and vectorial apparent volt-ampere hour are ignored substantially as the electric weight of actual measurement, and this is because lack the technology of their component of a vector of accurate measurement.Public company replaces other measured values of dependence such as quadergy and phasor volt-ampere hour etc., because these measuring techniques and equipment are developed easily.
The electronics watthour meter of traditional sampling can accurately be measured energy usually by the real-time power measured value that adds up.This generally obtains with following manner, to the voltage and current on power circuit sampling, the voltage and current of being sampled is converted to digital value, digital value is multiplied each other and calculates real-time power.These sampling accumulation are added and obtain the measured value of the energy that power circuit transmits, this is accurate for all significant harmonic waves basically, supposes that sampling rate satisfies sampling theory.Defined as ANSI/IEEE STD 100-1993, the apparent power of two-terminal circuit is:
U x＝E rms×I rms
E in the formula RmsAnd I RmsIt is the root-mean-square value of circuit voltage and electric current.Like this, the voltage and current on the power circuit is regarded as the synthetic quantity of sinusoidal signal, just can determine apparent power and (or apparent volt-ampere hour) of all harmonic waves on the phase power circuit by measure R MS voltage and current.
Yet it is just relatively more difficult to measure quadergy.Be to finish the measurement of reactive volt-ampere hour with the general instrument that watthour meter links to each other or usefulness has measurement watt-hour and the endogenous capacity of reactive volt-ampere hour in recent years traditionally with second instrument.Generally, the technology of measuring reactive volt-ampere hour relates to shift converter (in the analogue instrument) or retardation element (in the digital instrument) 90 ° of the voltage phase shifts of test line.These two kinds of methods may be born owing to ignore or fail the obvious errors of all remarkable harmonic waves of accurate phase shift voltage.
The someone gives chapter and verse the measuring method of the apparent volt-ampere hour of arithmetic as the method for approximation of the apparent volt-ampere hour of vector.The apparent power meter of the arithmetic of multiphase system shows the arithmetic sum of apparent power value of each phase during each mutually.Though calculate than being easier to, only power circuit respectively balance each other and the situation of symmetry under arithmetic apparent power trend accurately be similar to vectorial apparent power.Even under those situations, its measured value is often to cause unpredictable result under the non-sinusoidal environment at the waveform of electric current and voltage.These characteristics often make the arithmetic apparent power become the amount that is not suitable for electric measurement.
Under the situation that has distortion, traditional ammeter and measuring method may not provide the accurate measured value to the real cost of consumer's power supply.Increase to use solid-state switching motor driver, big Switching Power Supply and cause the current waveform that distorts such as the switch load of computing machine etc. is accompanied by a large amount of relevant distortion powers usually.Distortion power has increased the demand of public company equipment and has increased energy consumption.Measured value such as phasor volt-ampere hour and the apparent volt-ampere hour of arithmetic can not reasonably reflect the cost that these are relevant.
Along with the increase of transmission of electric energy cost, owing to adopt the caused error of these conventional measurement techniques more and more significant.Order about for cost with to the requirement of the fair charge of its consumer, public company more and more needs to reflect the accurate measurement method of the bona fide cost of transmission of electric energy.Yet in order to have continuity and alternative costs to be minimized, new equipment and method should be compatible mutually with the various circuit topologies that adopted in traditional instrument connection, traditional metering system and the power supply.
In view of the foregoing, the electric power that therefore an object of the present invention is to have for measurement the power circuit of at least two conductive paths provides ammeter and measuring method.
Another object of the present invention is that the electric power for the remarkable harmonic wave of the fundamental frequency of accurately measuring power circuit provides ammeter and measuring method.
Another purpose of the present invention provides and traditional ammeter connection compatibility and ammeter and measuring method that can utilize traditional metering system.
A further object of the present invention provides the ammeter and the measuring method of the measurement electric power of the circuit topology that is suitable for various power circuits.
By ammeter and measuring method in order to vector measurement electric power, detect line voltage and line current signal on the power circuit, detected conversion of signals is become digital signal, calculate detected line voltage and line current vectorial measured quantity, and these purposes and advantage are provided at the power circuit of the interval of orthogonality of determining.Therefore, just can realize accurately measuring vectorial measured quantity.The phasor measured quantity of calculating can comprise vectorial apparent volt-ampere hour, vectorial apparent power, the apparent volt-ampere hour of arithmetic, arithmetic apparent power, phasor volt-ampere hour, distortion volt-ampere hour, distortion power, quadergy, reactive power, energy, active power, power factor and distortion power factor.Utilization is integrated in the digital signal processor in conjunction with multi-purpose computer work in the ammeter just can implement phasor calculation device in order to the compute vector measured quantity best.
The present invention passes through accurately vector measurement electric power, just can accurately and liberally measure electric weight.On the basis of measured combination to volume and electricity, the present invention can also provide flexible, the programmable metering system of allowing that tested client pays.The present invention also easily is fit to different power supply environment, and, 3 line Δ shapes single-phase such as 4 line Y shapes, 3 lines etc. do not need element conversion or complicated hardware remodeling.Also help ammeter to install and the power circuit maintenance.
Specifically, use ammeter of the present invention, by detect line voltage on the power circuit and line current signal just can realize electric weight to quantitative determination.The interval of orthogonality of the voltage and current signal that is detected is according to the voltage signal that is detected and definite.The voltage and current signal that is detected is converted into digital signal, utilizes the vector calculation device to calculate the vectorial location parameter of interval of orthogonality from digital signal.Best, corresponding to continuous a plurality of sampling times that sampling interval separates, the voltage and current conversion of signals that is detected is become the line voltage and the line current sample of respective series.Sampling interval is preferably consistent.
Before the compute vector measured quantity, can calculate digital phase voltage (Phase-to-neutral voltage) signal and corresponding phase current signal from digital signal, thereby just define a certain phase of power circuit with respect to its reality or input neutral line.Best, digital phase voltage signal comprises a series of digital phase voltage samples, and digital phase current comprises a series of digital phase current samples, and each sample is corresponding to the sampling time of corresponding digital line voltage sample or digital line current specimen.
Preferably pass through to determine interval of orthogonality near fundamental frequency reference signal predetermined integers cycle of the frequency of the fundametal compoment of the voltage and current on the power circuit by detecting.Best, interval of orthogonality is represented 60 cycles of fundamental frequency reference signal of the 60Hz electric system of nominal, perhaps represents 50 cycles of fundamental frequency reference signal of the 50Hz electric system of nominal.Preferably determine interval of orthogonality, produce corresponding fundamental frequency phase voltage signal by the phase voltage signal that narrow-band filtering calculated.These fundamental frequency signals can linear combination, produces the fundamental frequency reference signal.
According to an aspect of the present invention, the vectorial measured quantity of calculating interval of orthogonality comprises the apparent volt-ampere hour of compute vector.Energy, quadergy and apparent volt-ampere hour are that the every power circuit mutually for interval of orthogonality calculates.Calculate the vectorial apparent volt-ampere hour of interval of orthogonality from energy, quadergy and the apparent volt-ampere hour of calculating.Can be from the distortion volt-ampere hour of this each phase of tittle computing electric line.As the skilled personnel to understand, by calculating energy, quadergy and the distortion volt-ampere hour of interval of orthogonality, the energy of calculating, quadergy and distortion volt-ampere hour are accurately represented the component of a vector of power circuit.Can carry out the vector algebra computing to these components, with the accurate measured value of the vectorial apparent volt-ampere hour that obtains the power circuit during interval of orthogonality.
Preferably by the reactive power wave filter being used for digital phase voltage signal and digital phase current signal calculates quadergy.This wave filter preferably includes the digital filter of being implemented in the vector calculation device.The reactive power wave filter preferably includes a plurality of phase shift filters and the multiplier that can produce the long-pending signal of two kinds of phase shift middle powers, and these two kinds of signal plus produce the output signal of precision near the quadergy of all harmonic waves of power circuit in the scheduled frequency range.
According to another aspect of the present invention, to be that power circuit calculates meritorious, idle, distortion and vectorial apparent power from energy, quadergy, distortion volt-ampere hour and the vectorial apparent volt-ampere hour of calculating.Preferably energy, quadergy, distortion or the vectorial apparent volt-ampere hour by the interval of orthogonality of will calculate divided by interval in the sampling number that taken place, and calculate these vector quantities, to obtain corresponding quantity of power.Can also be from energy, quadergy and the apparent volt-ampere hour of every phase during the described interval of calculating and calculate power factor and distortion power factor.
Of the present invention aspect another, from the neutral current value of the digital phase current signal computing electric line of calculating.Compare with the predetermined threshold of the unacceptable unbalance in phase of expression or other its maintenance situation by the neutral current value that will calculate, can calculate the state of neutral current.Similarly, compare with the nominal operation voltage of expection by the actual line voltage that will calculate and just can calculate the line voltage status.
Ten technology of taking out of employing migration can also be calculated the relevant phasing degree of fundamental component with the line voltage signal that detects.In a series of consecutive periods of fundamental frequency reference signal, select the sample of the narrow-band filtering form of digit line voltage signal, take out a sample to obtain one group of migration ten.These samples are advantageously selected to migration ten that making wins selects, and to take out a sample consistent with first zero cross point of fundamental frequency reference signal.It is to postpone the next cycle of the fundamental frequency reference signal that predetermined migration ten takes out an interval selected from lighting of the fundamental frequency reference signal waveform of taking out previous sample that the next migration of selecting ten is taken out a sample.Sample similarly from follow-up interval, therefore acquisition is taken out a sample near one group of migration ten of the one-period of digital voltage signal.Fourier analysis is used for these migrations ten and takes out a sample, in order to calculate the phasing degree with respect to the fundamental component of the line voltage signal of reference signal.The accurate measurement of the line voltage phase angle that can be used for instrument installation and maintenance and other task so just is provided.
In another aspect of the present invention, the measured quantity of interval of orthogonality can be in the cycle of being considered for minimum and maximal value accumulation ground record, analyze, other analysis with other purpose stands to be used to charge.Can calculate the measured quantity of being discerned according to relevant detent mechanism (detent).No matter the loss of the line voltage that detected, also can the compute vector measured quantity, the device of estimated power when transformer or other assembly break down so just is provided.
Therefore, provide can accurately measure vectorial measured quantity in order to the quantitative determination electric weight to electrometer and method.These instrument and method guarantee to measure accurately and reflect liberally the electric power of the cost of the energy of carrying to client.These instrument and method also are applicable to the circuit topology of various power circuits, and compatible mutually with traditional instrument connection and form.
Fig. 1 is the illustration synoptic diagram to electrometer of the present invention.
Fig. 2 is the illustration simplified block diagram to electrometer that is contained in the ammeter shell of the present invention.
Fig. 3 A is the block scheme of the illustration principle of work to electrometer of the present invention.
Fig. 3 B is the block scheme how the line voltage and current signal of illustration detection of the present invention converts digital phantom to.
Fig. 4 is the block scheme of the illustration principle of work to electrometer of the present invention.
Fig. 5 is the block scheme how illustration the present invention determines interval of orthogonality.
Fig. 6 is that illustration the present invention is how from the block scheme of the line voltage and current calculated signals vector measured quantity that detects.
Fig. 7 is that illustration the present invention is in order to calculate phase voltage signal and the block scheme of phase current signal with a certain computing mutually of current limit circuit.
Fig. 8 is the block scheme of illustration according to specified circuit topology compute vector measured quantity.
Fig. 9 is illustration the present invention calculates phase voltage sample and phase current sample according to specified circuit topology a typical operation table.
Figure 10 is the block scheme that illustration the present invention calculates each computing of the energy of every phase during the interval of orthogonality.
Figure 11 is the block scheme that illustration the present invention calculates each computing of the apparent volt-ampere hour of every phase during the interval of orthogonality.
Figure 12 A is the block scheme of illustration reactive power wave filter of the present invention.
Figure 12 B is the image of the transport function of illustration reactive power wave filter of the present invention.
Figure 13 is the block scheme of each computing of the quadergy of illustration the present invention every phase of calculating interval of orthogonality.
Figure 14 is the block scheme of each computing of illustration the present invention vectorial apparent volt-ampere hour of calculating the power circuit during the interval of orthogonality.
Figure 15 A is the block scheme that illustration the present invention calculates each computing of line voltage phase angle.
To be illustration the present invention carry out ten to the calculating at phasing degree to Figure 15 B takes out the block scheme of a sampling.
Figure 16 A is the block scheme of each computing of the nominal line voltage of illustration calculation expectation of the present invention.
Figure 16 B is the block scheme that illustration the present invention calculates each computing of active line voltage.
Figure 17 is the block scheme that illustration the present invention calculates each computing of line voltage status.
Figure 18 is the block scheme that illustration the present invention calculates each computing of neutral current value and neutral current state.
Figure 19 is the image of illustration vector power relation.
Just the present invention is described hereinafter in more detail now with reference to the accompanying drawing that shows most preferred embodiment of the present invention.Yet, the present invention can implement with many different forms, should not regard the present invention as and only limit to described these embodiment, and provide these embodiment to make that this disclosure is abundant and complete, and transmit scope of the present invention fully to those skilled in the art.Identical label relates to components identical in full.
Fig. 6-7,10-11,13,15A and 16A-18 are the process flow diagrams of method and system of the present invention.Should be understood that each square frame of process flow diagram and the combinations of blocks of process flow diagram can be implemented by computer program instructions.These computer program instructions can be loaded on computing machine or other programmable device, form a kind of machine, make the instruction of on computing machine or other programmable device, carrying out create in order to the flowchart square frame in the means of function of defined.These computer program instructions also can be stored in the readable memory of computing machine, energy instruct computer or other programmable device work with ad hoc fashion, make the computer program instructions that is stored in the computer-readable memory produce a kind of product, comprise the command device of the function of defined in the implementing procedure figure square frame.Computer program instructions also can be loaded on computing machine or other programmable device, a series of calculation step are carried out on computing machine or other programmable device, produce a kind of computer-implemented method, make the instruction of on computing machine or other programmable device, carrying out that the step in order to the function of defined in the implementing procedure figure square frame is provided.
Therefore, the square frame support of process flow diagram is in order to the combination of the device of the function that puts rules into practice with in order to the combination of the step of the function that puts rules into practice.What it is also understood that is to be the combination of the square frame of each square frame of combination implementing procedure figure of computer system based or specialized hardware and computer instruction and process flow diagram in order to specialized hardware, function that these computing machines put rules into practice and step.
To electrometer
Fig. 1 and 2 illustration is of the present invention to electrometer.The voltage and current signal that voltage sensor 110 and current sensor 120 detect on the power circuit, and voltage and current 315 input conversion apparatus 320 that detected.Conversion equipment 320 such as analog to digital converter (A/D) etc. can comprise signal processing circuit and sampling apparatus, signal processing circuit is got rid of the DC component in the voltage and current 315 that is detected, compensation is by caused phase shifts such as sensing devices, the voltage and current that sampling apparatus is then sampled and detected is to obtain digital signal 325.
Vector calculation device 330 shown in digital signal 325 input Fig. 1, the vector calculation device is included in the computer program of operation on digital signal processor 130, microcomputer 140 and the program/data-carrier store 150.Preferably digital signal processor (DSP) 130 carries out vector power calculating according to digital signal 325 under the control of microcomputer 140.Preferably a kind of high-speed processing device of digital signal processor 130 has the architecture of carrying out the highly-parallel of double counting fast.The example of digital signal processor is the device of digital signal processor of TMS320 * row of Texas Instruments Corporation.Except control figure signal processor 130, microcomputer 140 can also be controlled other peripherals, such as display 160 or communication interface 170.Those skilled in the art can understand the various combinations enforcement calculation elements 330 that can adopt the hardware and software that comprises other digital signal processing device or general processor.
As shown in Figure 2, sensing loading 310, conversion equipment 320 and vector calculation device 330 preferably are integrated in the standard form ammeter 200.Ammeter 200 can comprise LCD display 160 and optical port 170, in order to measurement data and datalogger or miscellaneous equipment are communicated.Ammeter 200 can directly be connected with the lead 220A-C of the power circuit 210 that is directly used in low pressure, low-power equipment, perhaps can cushion by adopting the voltage and current mutual inductor, and this is that those skilled in the art is known.
The vector electrical measurement is taken a broad view of
Those skilled in the art knows that have can be by at first determining its three quadrature components more than the vectorial apparent power (or vectorial volt-ampere hour) of the current circuit of a conductive path: active power (or energy), reactive power (or quadergy) and distortion power (or distortion volt-ampere hour) are determined.In vector entries: U → = P → + Q → + D → And | U → | = | P | → 2 + | Q | → 2 + | D | → 2
In electrometer, these components are that the interval of orthogonality at the sinusoidal component of the periodic voltage of power circuit and electric current is calculated of the present invention.
Those skilled in the art understands n-dimensional vector y can be expressed as basis vector x 1, x 2..., x nSum:
Y=c 1x 1+ c 2x 2+ ... + c nx n(1) if basis vector is a quadrature, the inner product of basis vector equals zero:
＜x i, x j〉=0, i ≠ j is along with the both sides of formula (1) form basis vector x iInner product, just produce:
＜y, x i〉=c l＜x 1, x i〉+c 2＜x 2, x i〉+...+c n＜x n, x i〉=c i＜x i, x j, in the formula c i = < y , x i > < x i , x j >
Like this, owing to can calculate coordinate c simply i, just can adopt the ultimate principle of quadrature to express vector easily.
Relation between orthogonality and the inner product is applicable to function usually.The inner product of two functions can be defined as the integration on certain interval: < g i ( t ) , g j ( t ) > = &Integral; t 1 t 2 g i ( t ) g j * ( t ) dt .
As basis vector, if two functions are quadratures, their inner product is zero:
<g i(t)，g j(t)>＝0，?i≠j.
Interval (t 1, t 2) be function g 1(t) and g (t) 2Interval of orthogonality.Function can be expressed as at interval of orthogonality (t 1, t 2) last orthogonal function sum:
f(t)＝c 1g 1(t)＋c 2g 2(t)＋......＋c ng n(t)
Therefore, utilize " vector algebra " can determine to be expressed as the function of the orthogonal function sum in the interval of orthogonality.
For the measured value with energy, quadergy and the apparent volt-ampere hour of the every phase of power circuit is accurately carried out the vector algebra computing, preferably measure in the interval of orthogonality these to the quantitative determination component, make that these are the accurate expressions of vectorial apparent volt-ampere hour to the quantitative determination component, promptly the inner product of voltage and current is zero.Comprise sinusoidal fundamental component and multiple-harmonic power circuit thereof for voltage and current, the interval of orthogonality of all sinusoidal voltages and electric current is the integral multiple cycle of fundamental component.
Explaining why preferably will in interval of orthogonality after the compute vector mensuration component, the computing according to vector measurement of the present invention just be described now.Fig. 3 A is the block scheme of the fundamental operation of illustration vector measurement of the present invention.The line voltage and the line current signal that utilize voltage sensor 110 and current sensor 120 to detect on the power circuit.In conversion equipment, the line voltage and the line current signal 315 of detection are converted into digital signal 325.325 input vector calculation elements 330 of digital signal, vector calculation device 330 is according to digital signal 325 compute vector measured quantities.
As shown in Fig. 3 B, in conversion equipment 320, preferably the form with a series of digit line voltage samples 326 and line current sample 327 produces digital signal 325.In sampling apparatus 321,, produce a plurality of line voltage and current samples 322 with the voltage and current signal 315 of predetermined sampling interval sample detecting.In sample changer 323, the voltage and current sample is converted into corresponding a series of digit line voltage sample 326 and digital line current specimen 327.Those skilled in the art can understand, for accurately calculate from the 60Hz fundamental frequency until 20 third harmonic of first-harmonic, be the power circuit vector measured quantity of 1380Hz, sampling rate must be greater than 2760 samples of per second.The sample best, that 327 expressions of digit line voltage sample 326 and digital line current specimen are adopted with the sampling interval of the sampling rate of 3900 samples of per second or about 26 microseconds.
According to the present invention, the computing 330 of the vector calculation device 330 of Fig. 1 and the vector calculation of Fig. 3 A can be resolved into the vectorial voltage and current signal 315 that detects the three-phase electric weight of equivalence.As shown in Figure 7, be preferably in each phase that limits power circuit in the square frame 700, its method is to obtain digit line voltage sample e at square frame 710 kCorresponding digital line current sample i k, calculate digital phase voltage sample at square frame 720, and calculate digital phase current sample at square frame 730.
The circuit topology of circuit-line is depended in square frame 720 and 730 calculating.As shown in Figure 8, disposed the circuit recognition device 810 in order to the identification circuit topology, according to the circuit topology that indicates, vector calculation device 330 carries out the corresponding calculating of digital phase voltage signal and digital phase current signal.Person of skill in the art will appreciate that circuit recognition device 810 can comprise that memory element, selection resistor, DIP switch setting device etc.In the table of Fig. 9 illustration the vector calculation device of Fig. 3 B for the exemplary calculated of different circuit topologies.The V of this table a, V bAnd V cExpression digit line voltage sample 326, I a, I bAnd I cExpression corresponding digital line current sample 327, and V Ao, V BoAnd V CoThe digital phase voltage sample of representing corresponding calculating, I Ao, I BoAnd I CoThe digital phase current sample of representing corresponding calculating.
Fig. 4 illustration Fig. 1 and 3A to electrometer, added in order to the interval of the interval of orthogonality of determining the voltage and current signal on the power circuit and determined device 420.As mentioned above, in the interval of orthogonality of the voltage and current signal of power circuit, carry out the calculating of vector power.Vector calculation device 330 can calculate the vectorial measured quantity of being determined device 420 determined interval of orthogonalitys by the interval.
Fig. 5 illustration utilizes vector calculation device 330 to determine the computing of interval of orthogonality from the voltage and current signal 315 that is detected.Produce the fundamental frequency reference signal 535 that frequency is about as much as the fundamental frequency of the line voltage that detected and line current signal 315.In order to produce fundamental frequency reference signal 535, in generation device 510, produce the phase voltage signal 715 that limits a certain phase of power circuit from the line voltage signal 315 that is detected.The digital phase voltage signal input narrow band filter 520 of each phase, the preferably big nominal fundamental frequency about power circuit in the center of narrow band filter 520 passbands is to produce fundamental frequency voltage signal 525.
The fundamental frequency voltage signal 525 that is produced combines in the linear combination device 530 of the weighted array of carrying out signal.The ratio of the best first fundamental frequency voltage signal is that the ratio that the ratio of about 1/2, the second fundamental frequency voltage signal is approximately 1/4, the three fundamental frequency voltage signal is approximately 1/8, and these scaling signal additions produce fundamental frequency reference signals 535.The signal that is obtained has the approximately fundamental frequency identical with the fundamental frequency of fundamental frequency voltage signal 525, even one of them of fundamental frequency voltage signal do not exist, for example under the situation of measuring three-phase power circuit that a line voltage loses or three-way Monophase electric power circuit, the signal that is obtained still exists.
For being the power circuit of feature, being a number of cycles that is equivalent to lowest frequency components between the public area of the orthogonality of the voltage and current of power circuit, being the integer range of fundamental frequency with fundamental frequency and multiple-harmonic thereof.Therefore, can determine the interval of orthogonality of power circuit by the pick-up unit 540 that the cycle of the predetermined quantity that detects digital baseband reference signal 535 passes through.The predetermined quantity cycle that preferably is used for determining the fundamental frequency reference signal 535 of interval of orthogonality can provide sufficiently long interval, allow that the calculating in each interval finished before the calculating of later span begins, the various accumulative totals of being carried out in the vector calculation device 330 are overflowed and looked in the interval.Generally, be the power circuit of 60Hz for nominal frequency, 60 weeks of fundamental frequency reference signal 535 are that nominal limited interval of orthogonality of the present invention in one second.Similarly, for nominal 50Hz power circuit, 50 weeks of fundamental frequency reference signal 535 limit interval of orthogonality.Yet, person of skill in the art will appreciate that the present invention can adopt other number of cycles of fundamental frequency reference signal 535.
The function that person of skill in the art will appreciate that generation device 510, narrow band filter 520, linear combination device 530 and pick-up unit 540 can combine with vector calculation device 330, for example is combined in the digital signal processor 130 of Fig. 1.Those skilled in the art will also appreciate that these devices also can implement individually in mimic channel, digital circuit and combination thereof.For example, generation device 510 can comprise resistor network, narrow band filter 520 can comprise analog band-pass filter, linear combination device 530 can comprise the simulation arithmetical circuit, 540 of pick-up units can comprise analogue zero crossing detector and relevant counter, the latter provides to vector calculation device 330 interrupts or other signal, with the expression interval of orthogonality.
Calculate the vectorial measured quantity relevant with power
The calculating of various vectorial measured quantities relevant with power in the vector calculation device 330 of this a part of key diagram 1 and Fig. 3 A is being described after electrometer and basic functional principle thereof.As an example that calculates the vectorial measured quantity relevant with power, Fig. 6 illustration is in order to be the computing that each phase electric power institute calculated energy, quadergy and apparent volt-ampere hour are calculated the vectorial apparent power of interval of orthogonality during interval of orthogonality.Figure 10,11,13 and 14 respectively illustrations in order to computation interval during the detailed computing of the every energy mutually of power circuit, every phase quadergy, every mutually apparent volt-ampere hour and vectorial apparent volt-ampere hour.Figure 12 A-12B illustration is of the present invention in order to calculating the reactive power wave filter of every phase quadergy, and the working condition of implementing idle wave filter in vector filter 330.
With reference to Fig. 6, in square frame 610,620,630, be respectively interval of orthogonality and calculate every phase energy, every phase quadergy and every mutually apparent ampere-hour.In square frame 640, calculate the vectorial apparent volt-ampere hour of this interval power circuit from each phase energy, quadergy and the apparent volt-ampere hour of being calculated.Generally, the distortion volt-ampere hour is calculated from every phase energy, quadergy and the apparent volt-ampere hour calculated:
Figure A9611725600251
Just can calculate energy, quadergy and the distortion volt-ampere hour of power circuit during the interval by every phase energy, quadergy and the addition of distortion volt-ampere hour of will be calculated.From institute's calculated energy, quadergy and distortion volt-ampere hour just can computation interval during the vectorial apparent volt-ampere hour of power circuit.Yet, person of skill in the art will appreciate that, though these calculating can individually carry out,, they also can be combined into compound calculating.
The computing that (square frame 1000) calculates every phase energy of interval of orthogonality according to the present invention of Figure 10 illustration.In square frame 1020, the digital phase voltage sample e that will in square frame 1010, be obtained kMultiply by corresponding digital phase current sample i kThe voltage and current sample in each sampling time of adding up in square frame 1030 is long-pending.At square frame 1040 after interval of orthogonality finishes, in square frame 1050, with the product of the voltage and current that adds up with sample size N SWith sampling time interval T s, to calculate the energy that power circuit was transmitted during the interval of orthogonality.
The computing that (square frame 1100) calculates every mutually apparent volt-ampere hour according to the present invention of Figure 11 illustration.In square frame 1120, the digital phase voltage sample e that will in square frame 1110, be obtained kGive square, with the product that obtained in square frame 1140 with before square the addition of digital phase voltage sample sum.Similarly, in square frame 1130, the digital phase current sample i that will in square frame 1110, be obtained kGive square, the product that is obtained adds up in square frame 1150.After finish in the interval, in square frame 1170, square digital phase voltage sample that adds up of every phase in interval and a square digital phase current sample that adds up be multiply by sample size N at square frame 1160 SWith sampling time interval T sProduct square, be equivalent to the amount of the apparent volt-ampere hour square of this phase during the interval of orthogonality with generation.In square frame 1180, calculate the apparent volt-ampere hour of this phase during this interval by getting this long-pending square root.
Figure 12 A illustration according to the present invention in order to calculate the reactive power wave filter 1210 of reactive power.Person of skill in the art will appreciate that for all significant harmonic waves, accurately measure the reactive power of a certain phase for the phase shifted version that multiply by corresponding phase current signal with phase voltage signal, phase voltage signal must be to the phase shift equally of all these harmonic waves.Traditional var hour meter generally can not obtain the phase shift of this unanimity, usually the component of phase shift fundamental frequency and some other frequency accurately.
By with phase voltage signal E and phase current signal I input reactive power wave filter 1210, can obtain consistent phase shift according to the present invention for required frequency band.The first phase shift filter H 1With third phase shift filter H 3Preferably produce first phase shift delta 1The recursion digital filter.Similarly, the second phase shift filter H 2With the 4th phase shift filter H 4Equally preferably produce second phase shift delta 2The recursion digital filter.These wave filters output separately multiplying each other and addition as shown in the figure produces output signal Q ', and its expression reactive power Q and frequency function are long-pending:
e(t)E∠α；
i(t)I∠β；
H 1(f)＝H 3(f)＝G 1∠δ 1；
H 2(f)＝H 4(f)＝G 2∠δ 2；
A＝G 1G 2[EIcos(β-α)cos(δ 2-δ 1)-EIsin(β-α)sin(δ 2-δ 1)]；
A＝G 1G 2[Pcos(δ 1-δ 2)-Qsin(δ 1-δ 2)]；
B＝G 1G 2[EIcos(β-α)cos(δ 1-δ 2)-EIsin(β-α)sin(δ 1-δ 2)]；
B＝G 1G 2[Pcos(δ 1-δ 2)＋Qsin(δ 1-δ 2)]；
And
Q’＝GB-GA＝2GG 1G 2sin(δ 1-δ 2)Q。
Person of skill in the art will appreciate that, if G 1, G 2With G be 1, the result just is reduced to:
Q’＝2sin(δ 1-δ 2)Q
Perhaps
Q’＝g(f)Q。
The transfer characteristics of function g (f)/2 has been shown among Figure 12 B.Phase shift filter H 1, H 2, H 3And H 4Transport function hank and make accurate approximate 90 degree of phase differential in the frequency band Δ f, thereby make phase differential δ 1-δ 2Sine near 1, make the reactive power in the accurate approximate frequency scope of output Q ' of wave filter.Best, Δ f cross over best until and comprise the scope of main harmonic wave of the fundamental frequency of the phase voltage of 23 subharmonic and phase current signal.Can be with output Q ' integration, to obtain the accurate measured value of quadergy.
Person of skill in the art will appreciate that reactive power wave filter 1210 can utilize mimic channel, special digital circuit or implemented by the software that moves on general processor.Figure 13 illustration is in order to the computing of the reactive power wave filter 1210 of implementing Figure 12 A, these computings can Fig. 3 A vector calculation device 330 in carry out (square frame 1300).First phase shift filter is applicable to the digital phase voltage sample e that is obtained in square frame 1305 k, in order to calculate the first digital phase voltage sample e at square frame 1310 k'.Second phase shift filter also is applicable to digital phase voltage sample e k, in order to calculate second phase shift numeral phase voltage sample e at square frame 1315 k".Similarly, the third phase shift filter that transport function is identical with first phase shift filter is applicable to the corresponding digital phase current sample i that is obtained in square frame 1305 k, in order to calculate first phase shift numeral phase current sample i at square frame 1320 k'.The 4th phase shift filter that transport function is identical with second phase shift filter also is applicable to digital phase current sample i k, in order to calculate second phase shift numeral phase current sample i at square frame 1325 k".
Second phase shift numeral phase voltage sample multiply by the first phase dephased current sample, in order to calculate the first middle power sample q in square frame 1330 k', first phase shift numeral phase voltage sample then multiply by the second phase dephased current sample, in order to calculate the second middle power sample q in square frame 1335 k".Deduct the second middle power sample from the first middle power sample, in order to calculate reactive power sample q at square frame 1340 kThe reactive power that in square frame 1345, adds up sample.When square frame 1350 finished in the interval, in square frame 1355, the reactive power sample that adds up multiply by sample number N SWith sampling time interval T S, the quadergy of calculating this phase during this interval.
Figure 14 at length illustration calculates the computing (square frame 1400) that vector table is seen volt-ampere hour from the energy that calculates, quadergy and the apparent volt-ampere hour of each phase of circuit-line.When interval of orthogonality finished, in square frame 1420, each determined that the energy that adds up of phase deducts as vector this mutually apparent volt-ampere hour from this interval with quadergy circuit-line at square frame 1410.In order to calculate the distortion volt-ampere hour of this interval interior this phase.By respectively the calculated value addition of all these tittles mutually of electric power vector is just calculated energy, quadergy and the distortion volt-ampere hour of power circuit at square frame 1430,1440 and 1450.In the apparent volt-ampere hour of square frame 1460 computational schemes, as square root sum square of energy, quadergy and distortion volt-ampere hour.
According to the present invention, the vectorial measured quantity of being calculated with the vector calculation device 330 among Fig. 3 A can comprise energy, quadergy, distortion power with and each measured quantity mutually accordingly.Person of skill in the art will appreciate that, can also calculate various power factors from the ratio of various measured quantities, for example distortion power factor etc.
Vector calculation device 330 can also calculate relevant quantity of power.Vector calculation device 330 preferably is stored in the quantity of institute's sample thief during the interval of orthogonality, thereby the mensuration of burst length is provided.Divided by the length of an interval degree, just can calculate vectorial apparent power by the vectorial apparent volt-ampere hour that will calculate from the vectorial apparent volt ampere hour meter of the interval of orthogonality that calculates.Similarly, by calculated energy just can be calculated active power from the energy meter in the interval of calculating divided by burst length, just can calculate reactive power divided by burst length from the quadergy of calculating by the quadergy that will calculate.
Person of skill in the art will appreciate that in vector calculation device 330 compute vector measured quantity is not limited to the calculation procedure of illustrated embodiment.For example according to the present invention, need not the apparent volt-ampere hour of first compute vector, but by calculate meritorious, the idle and distortion power of interval of orthogonality earlier from energy, quadergy and the apparent volt-ampere hour of each phase of power circuit, obtain the vector sum of these components then, just can calculate vectorial apparent power.The sample size that vectorial apparent power by the interval of orthogonality that will calculate multiply by in interval just can be from the apparent volt-ampere hour of the apparent power calculation outgoing vector of vector.
Utility power company often adds such as the client's charge to them such as the additional amount of quadergy or phasor volt-ampere hour etc. according to energy.Generally, " detent mechanism " also is used for the mensuration of this tittle, and for example, an energy of carrying and receiving to the energy of being carried, to institute, the charges such as quadergy of hysteresis only can be selected by public company.Vector calculation device 330 can calculate identification vector measured quantity to be measured.For example just can be discerned by the 170 identification measured quantities of the communication interface shown in Fig. 1 by vector calculation device 330 by measuring the skilled worker.Person of skill in the art will appreciate that the identification amount can comprise relevant detent mechanism, such as having only leading quadergy, that receive and energy etc. transmission.
Calculate other vectorial measured quantity
Vector calculation device 330 shown in Fig. 3 A can also calculate to other useful vectorial measured quantities such as power system security and maintenance, instrument installations, such as nominal operation voltage, line voltage status, neutral current value and the neutral current state of phasing degree, active line voltage, expection.Figure 15 A-15B illustration is calculated the phasing degree computing with respect to the line voltage 315 that is detected of the fundamental frequency reference signal 535 of Fig. 5.Figure 16 A-B illustration is calculated the computing of the nominal operation voltage of active line voltage and expection.The computing of the active line voltage calculating line voltage status of being calculated of Figure 17 illustration.At last, Figure 18 illustration is calculated the computing of neutral current value and neutral current state.
Figure 15 A-15B illustration is with respect to the phasing degree computing of the definite line voltage 315 that is detected of fundamental frequency reference signal 535 (see figure 5)s.The digit line voltage sample that is obtained in square frame 1510 carries out narrow-band filtering in square frame 1520, calculate the digital baseband line voltage sample of the fundamental component signal of the line voltage signal that a series of expression detects.In square frame 1530, select ten of one group of migration to take out a digit line voltage sample in the mode of from a series of cycles of fundamental frequency reference signal 535, respectively getting.
Especially as shown in Figure 15 B, ten of each migration is taken out a sample and is chosen to make it to postpone predetermined ten and take out an interval N from taking out a sample with respect to fundamental frequency reference signal 535 from previous ten 1Sampling time.Best, first ten takes out a sample e D1Be that interval of orthogonality begins the back, is first sample behind first zero cross point of the fundamental frequency reference signal 535 shown in Figure 18 B.Next ten take out a sample e D2Be from selecting previous sample e D1The waveform of fundamental frequency reference signal 535 on light and postpone ten and take out an interval N 1The next cycle of fundamental frequency reference signal 535 during choose in institute's sample thief.
Best, ten take out an interval N 1It is the cycle of fundamental component signal of the line voltage signal 315 that detected at selected this of interval of orthogonality group sample approximate representation of making.For 60Hz power circuit, for example approximately adopt 65 samples in the one-period with 3900 sample samplings of per second.If from the consecutive periods of fundamental frequency reference signal 535, select ten of migration to take out a sample, make each sample postpone ten of 13 samples from previous sample and take out an interval N with respect to the fundamental frequency reference signal 1, during the time interval in 60 cycles of fundamental frequency benchmark letter 535, just can select one group 5 ten to take out a sample, thereby near cycle of the fundamental component signal of the line voltage 315 that is detected.Take out an interval N for identical sampling rate and ten 1The 50Hz system, its waveform can be represented with 6 samples.
The phasing degree of the fundametal compoment of line voltage can be calculated with Fourier analysis in square frame 1550 after the interval of orthogonality of square frame 1540.Person of skill in the art will appreciate that: &theta; = tan - 1 ( E c E s )
In the formula E c = 2 M &Sigma; K = 0 M - 1 e dk cos 2 &pi;k N c N l N s F s 2
And E s = 2 M &Sigma; k = 0 M - 1 e dk sin 2 &pi;k N c N l N s F s 2
Be respectively the cosine and the sine term of Fourier series expression formula of taking out the fundamental component signal of the line voltage signal 315 that a sample monitors according to ten of M migration.For these formula, N SBe the quantity of institute's sample thief during interval of orthogonality, N CBe the nominal fundamental frequency (50 or 60Hz) of power circuit, N 1Be ten to take out an interval, F SIt then is sample frequency.
The vector calculation device 330 of Fig. 1 and 3A can also be from the active line voltage and the expection nominal operation voltage of line voltage signal 315 computing electric lines that detected, and the line voltage signal 315 that is detected according to the expection nominal operation monitoring voltage that is calculated.Illustration is calculated the computing of expection nominal operation voltage in Figure 16 A (square frame 1600).Be preferably in vector calculation device 330 initialization procedures or the effective voltage of the line voltage signal 315 that is detected in square frame 1610 calculates interval of orthogonalitys in the near future.In addition, the phasing degree that is preferably in the initialization procedure or in the near future can also calculates line voltage at square frame 1500.In square frame 1620, select the nominal operation voltage of expection from predetermined nominal operation voltage 1630 according to effective voltage that is calculated and the phasing degree of being calculated.Best, selected expection nominal operation voltage is the predetermined nominal operating voltage 1630 of the approaching effective voltage that calculates.Predetermined nominal operating voltage 1630 preferably includes the standard line voltage such as 120 volts, 240 volts, 277 volts etc.
Also can calculate expection nominal operation voltage according to the phasing degree of being calculated.For example, calculated effective voltage be close to equate drops between two predetermined nominal operating voltage such as 240 volts and 277 volts, and these predetermined nominal operating voltage generally correspond respectively to three-way single phase power supply and three-phase and four-line star is powered.Person of skill in the art will appreciate that these two kinds of electric power topologys can be distinguished with phasing degree different between the line voltage, i.e. line voltage 120 scales of generally being separated by of 277 volts of power supplies claim the phasing degree, and 240 volts line voltage of powering, 60 scales of generally being separated by claim the phasing degree.By select the phasing degree feature the predetermined nominal operating voltage vector calculation device 330 at approaching phasing degree of calculating just can calculate and expect nominal operation voltage.
The detailed example of Figure 16 B illustrates the computing of calculating active line voltage (square frame 1610).The line voltage sample that is obtained in component 1611 carries out narrow-band filtering in square frame 1612, filtered sample gives in square frame 1613 square, and the sample after square adds up in square frame 1614.At square frame 1615 after finish in the interval, square frame 1616 by will add up square the digit line voltage sample divided by sample size N SWith sampling time interval T SProduct, get its square root then, just can calculate the effective voltage during the interval.
Consult Figure 17 now, the expection nominal line voltage that is calculated can be used for calculating line voltage status (square frame 1700).In square frame 1710, calculate active line voltage.The line voltage status of being calculated is compared according to predetermined tolerance 1740 and expection nominal operation voltage, calculates the line voltage status in square frame 1720.The end personnel of this area will appreciate that, though the superpotential of the in the best state and power circuit that is calculated is relevant with the under-voltage situation, but also can calculate other line voltage status, such as statistic bias with respect to the effective voltage that is calculated of expection nominal operation voltage.What also will appreciate that is, for example can communicate to user, switchgear control system etc. from vector calculation device 330 by communication interface among Fig. 1 170 or state that display 160 calculated, is used for maintenance, outage and other purpose.What also will appreciate that is to calculate active line voltage and line voltage status at each interval of orthogonality or other predetermined time interval.
Consult Figure 18 now, vector calculation device 330 can also calculate from the digital phase current sample that is calculated and monitoring neutral current value (square frame 1800).Digital phase current sample addition in square frame 1820 of each phase that in square frame 1810, is obtained, itself and in square frame 1830, give square.Just can calculate the neutral current value by squared root sum square in square frame 1830.Compared by neutral current value and the predetermined threshold 1842 that will be calculated, just can be calculated the neutral current state at square frame 1840.Person of skill in the art will appreciate that the state that is calculated can communicate with user, switchgear control system etc., be used for maintenance, outage and other purpose.What also will appreciate that is to calculate neutral current value and state at each sampling time, each interval of orthogonality or other predetermined time interval.
Disclose several typical most preferred embodiments of the present invention in drawing and description, although adopted some specific terms, they just are used for bright in general, rather than the purpose that is used to limit.Recorded and narrated scope of the present invention in claims later.

Claims (50)

1. a measurement has the method for electric weight of the power circuit of at least two conductive paths, comprises by the performed the following step of ammeter:
Detect line voltage signal and line current signal on the power circuit;
For the line voltage and the line current signal that detect are determined interval of orthogonality;
The line voltage that is detected is become digital signal with the line current conversion of signals; And
Calculate the vectorial measured quantity of the power circuit of determined interval of orthogonality from described digital signal.
2. according to the method for claim 1, it is characterized in that, was the following step before the step of described compute vector measured quantity:
Calculate corresponding digital phase voltage signal and digital phase current signal from digital signal, thereby limit a certain phase of power circuit; And
The step of described compute vector measured quantity comprises from the vectorial measured quantity of the power circuit of digital phase voltage signal and digital phase current signal calculating interval of orthogonality.
3. according to the method for claim 2, it is characterized in that the step of the vectorial measured quantity of the power circuit of described calculating interval of orthogonality comprises the following steps:
Calculate the vectorial apparent volt-ampere hour of the power circuit of interval of orthogonality from digital phase voltage signal and digital phase current signal.
4. according to the method for claim 3, it is characterized in that the step of the vectorial apparent volt-ampere hour of the power circuit of described calculating interval of orthogonality comprises the following steps:
The energy that each of power circuit of calculating interval of orthogonality from digital phase voltage signal and digital phase current signal determined mutually to be carried;
Each of power circuit of calculating interval of orthogonality from digital phase voltage signal and digital phase current signal determined quadergy mutually;
Each of power circuit of calculating interval of orthogonality from digital phase voltage signal and digital phase current signal determined apparent volt-ampere hour mutually;
Determine that from each of the power circuit of the interval of orthogonality that calculated energy, quadergy and the apparent volt-ampere hour of phase calculate the vectorial apparent volt-ampere hour of the power circuit of interval of orthogonality.
5. according to the method for claim 2, it is characterized in that the step of the vectorial measured quantity of the power circuit of described calculating interval of orthogonality comprises the following steps:
Calculate the quadergy of the power circuit of interval of orthogonality from digital phase voltage signal and digital phase current signal.
6. according to the method for claim 5, it is characterized in that each determines that the step of the quadergy of phase is included as each phase voltage signal and corresponding performed the following step of phase current signal the power circuit of described calculating interval of orthogonality:
First phase shift filter that will have first transport function is used for digital phase voltage signal, thereby calculates first phase shift numeral phase voltage signal;
Second phase shift filter that will have second transport function is used for digital phase voltage signal, thereby calculates second phase shift numeral phase voltage signal;
The third phase shift filter that will have first transport function is used for digital phase current signal, thereby calculates first phase shift numeral phase current signal;
The 4th phase shift filter that will have second transport function is used for digital phase current signal, thereby calculates second phase shift numeral phase current signal;
First phase shift numeral phase voltage signal be multiply by second phase shift numeral phase current signal, thereby calculate the long-pending signal of first middle power;
Second phase shift numeral phase voltage signal be multiply by first phase shift numeral phase current signal, thereby calculate the long-pending signal of second middle power;
From the power circuit of long-pending signal of first middle power and the long-pending calculated signals interval of orthogonality of second middle power quadergy of phasing really.
7. according to the method for claim 2, it is characterized in that the step of the vectorial measured quantity of the power circuit of described calculating interval of orthogonality comprises the following steps:
Calculate the distortion volt-ampere hour of the power circuit of interval of orthogonality from digital phase voltage signal and digital phase current signal.
8. according to the method for claim 7, it is characterized in that the step of the distortion volt-ampere hour of the power circuit of described calculating interval of orthogonality comprises the following steps:
The energy that each of power circuit of calculating interval of orthogonality from the digital phase voltage signal of interval of orthogonality and digital phase current signal determined mutually to be transmitted;
Each of power circuit of calculating interval of orthogonality from digital phase voltage signal and digital phase current signal determined quadergy mutually;
Each of power circuit of calculating interval of orthogonality from digital phase voltage signal and digital phase current signal determined apparent volt-ampere hour mutually;
Determine that from each of the power circuit of interval of orthogonality energy, quadergy and the apparent volt-ampere hour of phase calculate the distortion volt-ampere hour of the power circuit of interval of orthogonality.
9. according to the method for claim 2, it is characterized in that the step of the vectorial measured quantity of the power circuit of described calculating interval of orthogonality comprises the following steps:
Calculate the distortion power factor of the power circuit of interval of orthogonality from digital phase voltage signal and digital phase current signal.
10. according to the method for claim 1, it is characterized in that the step of described definite interval of orthogonality comprises the following steps:
Produce phase voltage signal from the line voltage signal and the line current signal that are detected, thereby limit a certain phase of power circuit; And
Determine interval of orthogonality from phase voltage signal.
11. the method according to claim 2 is characterized in that, is the following step before the step of digital phase voltage signal of described calculating and digital phase current signal:
The circuit topology of identification power circuit; And
The step of wherein calculating digital phase voltage signal and digital phase current signal comprises the step of calculating digital phase voltage signal and digital phase current signal according to the circuit topology of the power circuit of being discerned.
12. the method according to claim 2 is characterized in that, the step of described compute vector measured quantity comprises the following steps:
Neutral current value from the digital phase current signal computing electric line that calculated.
13. the method according to claim 2 is characterized in that, the step of described compute vector measured quantity comprises the following steps:
Calculate the active line voltage of the power circuit of interval of orthogonality from digital signal.
14. the method according to claim 2 is characterized in that, is the following step before the step of described compute vector measured quantity:
Discern vectorial measured quantity to be measured; And
Wherein the described step of compute vector measured quantity comprises the step of the vectorial measured quantity that calculating is discerned.
15. the method according to claim 2 is characterized in that, is the following step before the step of described compute vector measured quantity:
Discern vectorial measured quantity to be measured and relevant mensuration detent mechanism; And
Wherein the described step of compute vector measured quantity comprises the step of calculating the vectorial measured quantity of being discerned according to relevant mensuration detent mechanism.
16. the method according to claim 2 is characterized in that, is the following step before the step of digital phase voltage sample of described calculating and digital phase current sample:
No-voltage on the conductive path of detection power circuit; And
The step of wherein calculating digital phase voltage sample and digital phase current sample comprises the step of calculating digital phase voltage sample and digital phase current sample regardless of no-voltage on the conductive path of power circuit.
17. a measurement has the method for electric weight of the power circuit of at least two conductive paths, comprises by the performed the following step of ammeter:
Detect line voltage signal and line current signal on the power circuit;
From the line voltage and the line current signal that are detected is that line voltage and the line current signal that is detected on the power circuit determined interval of orthogonality;
The line voltage and the line current signal that are detected are sampled with a plurality of continuous sampling times of being separated by predetermined sampling time interval, thereby obtain a plurality of line voltage samples and line current sample;
Line voltage sample changeover is become corresponding digit line voltage sample, the line current sample changeover is become corresponding digital line current specimen; And
Calculate the vectorial measured quantity of the power circuit of predetermined interval of orthogonality from the digit line voltage sample of interval of orthogonality and digital line current specimen.
18. the method according to claim 17 is characterized in that, is the following step before the step of described compute vector measured quantity:
Calculate corresponding digital phase voltage sample and digital phase current sample from digit line voltage sample and digital line current specimen, thereby limit a certain phase of power circuit; And
Wherein the described step of compute vector measured quantity comprises the vectorial measured quantity of calculating the power circuit of interval of orthogonality from the digital phase voltage sample and the digital phase current sample of interval of orthogonality.
19. the method according to claim 18 is characterized in that, the step of the vectorial measured quantity of the power circuit of described calculating interval of orthogonality comprises the following steps:
Calculate the vectorial apparent volt-ampere hour of the power circuit of interval of orthogonality from the digital phase voltage sample of interval of orthogonality and digital phase current sample.
20. the method according to claim 19 is characterized in that, the step of the vectorial apparent volt-ampere hour of the power circuit of described calculating interval of orthogonality comprises the following steps:
The energy that each of power circuit of calculating interval of orthogonality from the digital phase voltage sample of interval of orthogonality and digital phase current sample determined mutually to be transmitted;
Each of power circuit of calculating interval of orthogonality from the digital phase voltage sample of interval of orthogonality and digital phase current sample determined quadergy mutually;
Each of power circuit of calculating interval of orthogonality from the digital phase voltage sample of interval of orthogonality and digital phase current sample determined apparent volt-ampere hour mutually; And
Really energy, quadergy and the apparent volt-ampere hour of phasing are calculated the vectorial apparent volt-ampere hour of the power circuit of interval of orthogonality from the power circuit of interval of orthogonality.
21. the method according to claim 18 is characterized in that, the step of the vectorial measured quantity of the power circuit of described calculating interval of orthogonality comprises the following steps:
Calculate the quadergy of the power circuit of interval of orthogonality from the digital phase voltage sample of interval of orthogonality and digital phase current sample.
22. the method according to claim 21 is characterized in that, each of the power circuit of calculating interval of orthogonality determines that the described step of the quadergy of phase is included as phase voltage sample and corresponding performed the following step of phase current sample:
First phase shift filter that will have first transport function is used for digital phase voltage sample, thereby calculates first phase shift numeral phase voltage sample;
Second phase shift filter that will have second transport function is used for digital phase voltage sample, thereby calculates second phase shift numeral phase voltage sample;
The third phase shift filter that will have first transport function is used for digital phase current sample, thereby calculates first phase shift numeral phase current sample;
The 4th phase shift filter that will have second transport function is used for digital phase current sample, thereby calculates second phase shift numeral phase current sample;
First phase shift numeral phase voltage sample be multiply by second phase shift numeral phase current sample, thereby calculate the long-pending sample of first middle power;
Second phase shift numeral phase voltage sample be multiply by first phase shift numeral phase current sample, thereby calculate the long-pending sample of second middle power;
Calculate this quadergy mutually of power circuit of interval of orthogonality from long-pending sample of first middle power of interval of orthogonality and the long-pending sample of second middle power.
23. the method according to claim 18 is characterized in that, the step of the vectorial measured quantity of the power circuit of described calculating interval of orthogonality comprises the following steps:
Calculate the distortion volt-ampere hour of the power circuit of interval of orthogonality from the digital phase voltage sample of interval of orthogonality and digital phase current sample.
24. the method according to claim 23 is characterized in that, the step of the distortion volt-ampere hour of the power circuit of described calculating interval of orthogonality comprises the following steps:
The energy that each of power circuit of calculating interval of orthogonality from the digital phase voltage sample of interval of orthogonality and digital phase current sample determined mutually to be transmitted;
Each of power circuit of calculating interval of orthogonality from the digital phase voltage sample of interval of orthogonality and digital phase current sample determined quadergy mutually;
Each of power circuit of calculating interval of orthogonality from the digital phase voltage sample of interval of orthogonality and digital phase current sample determined apparent volt-ampere hour mutually;
Determine that from each of the power circuit of interval of orthogonality energy, quadergy and the apparent volt-ampere hour of phase calculate the distortion volt-ampere hour of the power circuit of interval of orthogonality.
25. the method according to claim 18 is characterized in that, the step of the vectorial measured quantity of the power circuit of described calculating interval of orthogonality comprises the following steps:
Calculate the distortion power factor of the power circuit of interval of orthogonality from the digital phase voltage sample of interval of orthogonality and digital phase current sample.
26. the method according to claim 18 is characterized in that, the step of the vectorial measured quantity of the power circuit of described calculating interval of orthogonality comprises the following steps:
Narrow-band filtering is corresponding to the digit line voltage sample of the signal of the line voltage that is detected, thus a series of digital baseband line voltage samples of the fundamental component of the line voltage signal that the acquisition expression is detected; And
Calculate the fundamental component of the line voltage signal that is detected and the phasing degree between the fundamental frequency reference signal.
27. the method according to claim 18 is characterized in that, is the following step before the step of digital phase voltage sample of described calculating and digital phase current sample:
The circuit topology of identification power circuit; And
The step of wherein calculating digital phase voltage sample and digital phase current sample comprises the step of calculating digital phase voltage sample and digital phase current sample according to the circuit topology of the power circuit of being discerned.
28. the method according to claim 2 is characterized in that, also comprises the following steps:
Neutral current value from the digital phase current sample computing electric line that calculated.
29. the method according to claim 28 is characterized in that, the step of described compute vector measured quantity also comprises the following steps:
The active line voltage that is calculated is compared with predetermined expection nominal operation voltage, thereby calculate the line voltage status.
30. the method according to claim 18 is characterized in that, is the following step before the step of described compute vector measured quantity:
Discern vectorial measured quantity to be measured; And
Wherein the described step of compute vector measured quantity comprises the step of the vectorial measured quantity that calculating is discerned.
31. the method according to claim 18 is characterized in that, is the following step before the step of digital phase voltage sample of described calculating and digital phase current sample:
No-voltage on the conductive path of detection power circuit; And
The described step of wherein calculating digital phase voltage sample and digital phase current sample comprises the step of calculating digital phase voltage sample and digital phase current sample regardless of no-voltage on the conductive path of power circuit.
32. a measurement have at least two conductive paths power circuit electric weight to electrometer, described ammeter comprises:
Detect the voltage sensor of the line voltage signal on the power circuit;
Detect the current sensor of the line current signal on the power circuit;
Response the line voltage signal and the line current signal that are detected are determined device in order to the interval of the interval of orthogonality of the line voltage signal determining to be detected and line current signal;
Become the conversion equipment of digital signal with the line current conversion of signals in order to the line voltage signal that will be detected; And
Respond described interval and determine device and described conversion equipment, in order to the device of the vectorial measured quantity of the power circuit that calculates determined interval of orthogonality from digital signal.
33. according to claim 32 to electrometer, it is characterized in that, thereby described vector calculation device comprises in order to calculate a certain device mutually that corresponding digital phase voltage signal and digital phase current signal limit power circuit from digital signal.
34. according to claim 33 to electrometer, it is characterized in that described vector calculation device comprises the device in order to the vectorial apparent volt-ampere hour of the power circuit that calculates interval of orthogonality from digital phase voltage signal and digital phase current signal.
35. according to claim 34 to electrometer, it is characterized in that described vector calculation device also comprises the device in order to the vectorial apparent power of the power circuit that calculates interval of orthogonality from the apparent volt-ampere hour of the power circuit of the interval of orthogonality that calculated.
36. according to claim 33 to electrometer, it is characterized in that described vector calculation device comprises the device in order to the quadergy of the power circuit that calculates interval of orthogonality from digital phase voltage signal and digital phase current signal.
37. according to claim 33 to electrometer, it is characterized in that described vector calculation device comprises the device in order to the distortion volt-ampere hour of the power circuit that calculates interval of orthogonality from digital phase voltage signal and digital phase current signal.
38. according to claim 33 to electrometer, it is characterized in that described interval of orthogonality determines that device comprises:
In order to produce the device of fundamental frequency reference signal from phase voltage signal; And
Thereby respond described generation device, in order to detect the device that pass through definite interval of orthogonality in fundamental frequency reference signal predetermined quantity cycle.
39. according to claim 38 to electrometer, it is characterized in that described treating apparatus comprises:
Each phase voltage signal is carried out the narrow band filter of filtering, the corresponding fundamental frequency phase voltage signal of generation; And
Respond described narrow band filter, in order to linear combination fundamental frequency phase voltage signal, produce the linear combination device of fundamental frequency reference signal.
40. according to claim 33 to electrometer, it is characterized in that also comprising:
The circuit recognition device of circuit topology in order to the identification power circuit; And
Wherein saidly comprise in order to calculate the device of digital phase voltage signal and digital phase current signal according to the power circuit discerned topology in order to the device that calculates digital phase voltage signal and digital phase current signal.
41. according to claim 33 to electrometer, it is characterized in that: described vector calculation device comprises in order to the device from the neutral current value of the digital phase current signal computing electric line that calculated.
42. according to claim 33 to electrometer, it is characterized in that: described vector calculation device comprises the device in order to the active line voltage of a certain circuit of the power circuit that calculates interval of orthogonality from digital signal.
43. according to claim 42 to electrometer, it is characterized in that: described vector calculation device also comprises:
In order to device from the circuit phasing degree of digital signal computing electric line;
Respond described in order to calculate active line voltage with described in order to the device that calculates the phasing degree, in order to from a plurality of predetermined nominal operating voltage that relevant nominal phase angle respectively arranged, to select near the active line voltage that is calculated and the relevant nominal phase angle device of the expection nominal operation voltage at approaching phasing degree of calculating.
44. according to claim 33 to electrometer, it is characterized in that: described vector calculation device comprises:
In order to discern the device of vectorial measured quantity to be measured; And
Respond described recognition device, in order to calculate the device of the vectorial measured quantity discerned.
45. according to claim 33 to electrometer, it is characterized in that also comprising:
In order to no-voltage device on the conductive path that detects power circuit; And
Wherein saidly comprise in order to no matter no-voltage and calculate the device of digital phase voltage signal and digital phase current signal on the conductive path of power circuit in order to the device that calculates digital phase voltage signal and digital phase current signal.
46. a measurement have at least two conductive paths power circuit electric weight to electrometer, described ammeter comprises:
Detect the voltage sensor of the line voltage signal on the power circuit;
Detect the current sensor of the line current signal on the power circuit;
In order to line voltage signal and the line current signal from being detected, device is determined in the interval of the line voltage signal of determining on the power circuit to be detected and the interval of orthogonality of line current signal;
Thereby respond described voltage sensor and described current sensor, obtain the sampling apparatus of a plurality of line voltage samples and line current sample in order to the line voltage signal that detected and line current signal are sampled in continuous sampling time of a plurality of predetermined sampling time intervals of being separated by;
Respond described sampling apparatus, sample changer in order to each line voltage sample changeover become corresponding digit line voltage sample and each line current sample changeover to be become corresponding digital line current specimen; And
Respond described interval and determine device and described sample changer, the vector calculation device of the vectorial measured quantity of the power circuit that calculates determined interval of orthogonality in order to digital voltage sample and digital current sample from interval of orthogonality.
47. a method of measuring the reactive power of power circuit comprises the following steps:
Detect voltage signal and current signal on the power circuit;
According to first phase shift voltage signal is carried out phase shift, to obtain the first phase shift voltage signal;
According to second phase shift voltage signal is carried out phase shift, to obtain the second phase shift voltage signal;
According to first phase shift current signal is carried out phase shift, to obtain the first phase shifted current signal;
According to second phase shift current signal is carried out phase shift, to obtain the second phase shifted current signal;
The first phase shift voltage signal be multiply by the second phase shifted current signal, thereby obtain the long-pending signal of first middle power;
The second phase shift voltage signal be multiply by the first phase shifted current signal, thereby obtain the long-pending signal of second middle power; And
With long-pending signal of first middle power and the long-pending signal plus of second middle power, obtain the output signal of the reactive power of the power circuit in the expression scheduled frequency range.
48. a system of measuring the reactive power of power circuit comprises:
Detect the voltage sensor of the voltage on the power circuit;
Detect the current sensor of the electric current on the power circuit;
Respond described voltage sensor, voltage signal carried out phase shift, to obtain first phase changer of the first phase shift voltage signal according to first phase shift;
Respond described voltage sensor, voltage signal carried out phase shift, to obtain second phase changer of the second phase shift voltage signal according to second phase shift;
Respond described current sensor, current signal carried out phase shift, to obtain the third phase moving device of the first phase shifted current signal according to first phase shift;
Respond described current sensor, current signal carried out phase shift, to obtain the 4th phase changer of the second phase shifted current signal according to second phase shift;
Respond described first phase changer and described the 4th phase changer, the first phase shift voltage signal be multiply by the second phase shifted current signal, to obtain first multiplier of the long-pending signal of first middle power;
Respond described second phase changer and described third phase moving device, the second phase shift voltage signal be multiply by the first phase shifted current signal, to obtain second multiplier of the long-pending signal of second middle power;
And
Respond described first multiplier and described second multiplier, the long-pending signal of first middle power and second middle power are amassed signal plus, the totalizer of the output signal of the reactive power of the power circuit in the acquisition expression scheduled frequency range.
49. a method that produces frequency near the fundamental frequency reference signal of the fundamental frequency of the voltage and current signal on the power circuit comprises the following steps:
Detect the voltage signal on the power circuit;
Handle the voltage signal that is detected, produce at least three kinds of phase voltage signals;
Each phase voltage signal is carried out narrow-band filtering, produce corresponding fundamental frequency phase voltage; With
Linear combination fundamental frequency phase voltage signal produces the fundamental frequency reference signal.
50. a system that produces frequency near the fundamental frequency reference signal of the frequency of the fundamental component of the voltage signal on the power circuit comprises:
Detect the voltage sensor of the voltage signal on the power circuit;
Respond described voltage sensor, in order to handle the voltage signal detected, produce the device of at least three kinds of phase voltage signals;
Respond described treating apparatus, each phase voltage signal is carried out narrow-band filtering, produce the narrow band filter of corresponding fundamental frequency phase voltage; With
Respond described narrow band filter, in order to linear combination fundamental frequency phase voltage signal, produce the linear combination device of fundamental frequency reference signal.
CN96117256.8A 1995-11-30 1996-11-30 Vector electricity meters and associated vector electricity metering methods Expired - Fee Related CN1108528C (en)

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US5854995A (en) 1998-12-29
US6173236B1 (en) 2001-01-09
CN1108528C (en) 2003-05-14
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US5673196A (en) 1997-09-30
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BR9605750A (en) 1998-08-25
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US5978741A (en) 1999-11-02
ES2319826T3 (en) 2009-05-12
CA2190905A1 (en) 1997-05-31

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